Magnesium amino-bis(phenolato) complexes for the ring-opening polymerization of rac-lactide.


Magnesium compounds of tetradentate amino-bis(phenolato) ligands, Mg[L1] (1) and Mg[L2] (2) (where [L1] = 2-pyridyl-N,N-bis(2-methylene-4-methoxy-6-tert-butylphenolato), and [L2] = dimethylaminoethylamino-N,N-bis(2-methylene-4-methyl-6-tert-butylphenolato)) were prepared. The proligands, H2[L1] and H2[L2] were reacted with di(n-butyl)magnesium in toluene to give the desired compounds in high yields. Compounds 1 and 2 exhibit dimeric structures in solutions of non-coordinating solvents as observed by NMR spectroscopy and in the solid state as shown by the single crystal X-ray structure of 2. These compounds exhibit good activity for rac-lactide polymerization in solution and in molten lactide.

DOI: 10.1039/c5dt00236b

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@article{DevainePressing2015MagnesiumAC, title={Magnesium amino-bis(phenolato) complexes for the ring-opening polymerization of rac-lactide.}, author={Katalin Devaine-Pressing and Joshua H Lehr and Michelle E Pratt and Louise Nicole Dawe and Amy Alexis Sarjeant and Christopher M. Kozak}, journal={Dalton transactions}, year={2015}, volume={44 27}, pages={12365-75} }